Posthole boring machine



y 8, 1952 ,l. w. TALBOT POSTHOLE BORiNG MACHINE .3 Sheets-Sheet 1 Filed April 19, 1949 lni'eutor Irvin W. T0100! July 8, 1952 w. TALBOT 2,602,637

POSTHOLE BORING MACHINE Filed April 19, 1949 s Sheets-Shea; 2

N N m mmvmvn V VV'V'V' Inventor Iryin Ta/bbt l. W. TALBOT POSTHOLE BORING MACHINE July 8, 1952 Filed April 19, 1949 3 Sheets-Sheei Inventor Irv/n w. Talbot and Patented July 8, 1952 UNITED STATE POSTHOLE BORING MACHINE Irvin W.. Talbot, Rush Hill, Mo. Application April 19, 1949, Serial No. 88,348

1 Claim.

This invention relates to post hole boring machines, and has more particular reference to a posthole boring attachment for tractors.

The primary object of the present invention is to provide a post hole boring device which may be readily attached to the tractor so that the auger may be driven from the power take-off of said tractor, and wherein a hydraulic power device is provided to advance the auger into and withdraw the same from the ground.

Another object of the present invention is to provide a post hole boring device of the above kind which is simple in construction, efficient in operation and easy to controhand wherein the auger is readily tiltable for boring post holes vertically or at a desired inclination.

The exact nature of the present invention, as well as other objects and features thereof, will become apparent from the following description when considered in connection with the accompanying drawings, in which:

Figure 1 is a side perspective view of a tractor equipped with a post hole boring attachment constructed in accordance with the present invention;

Figure 2 is an thereof;

Figure 3 is an enlarged fragmentary horizontal section taken on the line 3 -3 of Figure 2;

Figure 4 is an enlarged fragmentary vertical section taken substantially on the line 4-4 of Figure 3;

Figure 5 is an enlarged fragmentary vertical section, partly broken away, taken substantially on the line 5-5 of Figure 3.

Referring in detail to the drawings, 5 indicates a conventional tractor having a transverse power take-ofi shaft at one side which is equipped with a pulley 6, and having the usual front and rear steering and traction wheels 1 and 8, respectively. As usual, the driver's seat 9 is at the rear portion of the tractor, and driving of the power take-off shaft is controlled from the drivers seat by conventional means (not shown).

The present attachment includes a supporting bracket composed of a pair of spaced vertical bars lil rigidly secured by suitable means to that side of the tractor frame at which the power take-off shaft is located and in a position between the front and rear wheels 1 and 8 at that side of the tractor, a horizontal U-shaped frame member H having its ends secured to the upper ends of the bars H] by bolts [2 or the like, and inclined braces l3 extending between the outer ends of the legs of frame member enlarged front elevationalview nally slidable through the housing It.

II and the lower portions of the bars l0. Thus,

the frame member II is rigidly mounted on and projects laterally from the tractor frame above the latter and adjacent and in front of therear traction wheel 8 at the adjacent side of the tractor. A cross piece It connects the legs of the frame member I 1 near their inner ends, and this cross piece is provided intermediate its ends with a bearing 15. A gear housing 16 is arranged within the frame member Il outwardly of the cross piece l4, and such gear housing is provided at opposite sides with aligned stub shafts I1 and IB respectively journaled in the intermediate portion of frame member H and in the bearing 15 of cross piece I4, so that the gear housing is tiltable about a horizontal axis disposed transversely of the tractor. The stub shaft I8 is tubular, and a transverse driven shaft I9 is journaled in and projects inwardly of this stub shaft. An elongated substantially upright auger shaft 20 is disposed at right angles to the driven shaft 19 and is rotatable in and longitudi- Bevel gearing is provided between the shafts I9 and 20 including a pinion 2| secured on the outer end of shaft [9 within the housing l6, and a gear 22 meshing with the pinion 2i and having the auger shaft 20 slidably keyed therein. A pulley 23 is secured on the inner end of shaft I9, and an endless power transmission belt 24 passes around the pulleys 6 and 23. An auger, 25 is attached to the lower end of shaft 20 beneath the housing [6. Thus, it will be seen that means is provided for rotatably driving the auger 25 from the power take-off shaft of the tractor, and that the shaft 20 may be moved longitudinally to advance the auger into or withdraw the same from the ground. Also, by lowering the auger into contact with the ground and backing the tractor, the auger may be disposed in a tilted position for boring holes at different inclinations.

A hydraulic power device is provided for moving the shaft 20 longitudinally so as to selectively advance the auger into the ground or to withdraw the same from the ground. This hydraulic power device includes a pair of cylinders 26 and 21 rigidly secured as at 28 and 29 adjacent their upper ends to the rear and front sides of gear housing [6, each of said cylinders having a piston 30 reciprocable therein. The piston of each cylinder is carried by the lower end of a piston rod 3! which slidably projects upwardly througha stuffing box 32 at the top of the associated cylinder and is rigidly connected at its upper end to an end of'a cross head 33 in which the upper end of auger shaft 20 is journaled as at 34.

The pistons 30 are operated by a pressure medium that is simultaneously admitted to the respective ends of the cylinders through pipes 35 and 36 and flexible conduits 31 and 38 from a pump (not shown) operated by the engine of the tractor, a suitable conventional control valve, also not shown, being provided whereby pressure fluid is exhausted from corresponding ends of the cylinders when supplied to the other ends thereof, and vice versa. One type of valve suitable for this purpose is shown in the U. S. patent to R. H.

Dobbs, #2,456,819, December 21, 19.48; In other words, the pressure fluid may be simultaneously admitted to the upper ends of the cylinders while exhausting it from the lower ends ofsaidcylinders, so as to force the auger downwardly and thereby feed it into the ground as the auger'is rotatably driven from the power take-off of the tractor. Also, the pressure fluidmay be simultaneously admitted to the lower ends of the cylinders while exhausting it from the upper ends thereof, thereby withdrawingth'e auger from the ground after the post hole has beenbored. Obviously, the control valve may lee-advantageously mounted within reach of the driver occupying the seat 9.-

From the foregoing description, it is believed thatthe construction, operation and advantages of the present invention will be readily understood and appreciated by those skilled in the art. It will be seen that .the device is composed of a minimum number of ,simple parts which are compactly arranged, and that the device may be readily applied to or installed upon existing tractors in an economical and expeditious manner. Minor changes indetails of construction illustrated and described are contemplated, such as fairly fall within the spirit and scope of the invention as claimed.

Having described the invention, what is claimed as newis':

' In combination with a tractor having a transincluding spaced vertical bars secured to the tractor frame, a horizontal U-shaped frame member secured at its ends to the upper ends of said bars, and a cross piece connecting the legs of said U-shaped frame member and provided intermediate its ends with a bearing, a gear housing arranged within the U-shaped frame member outwardly of said cross piece, said gear housing having stub shafts at, opposite sides thereof respectively journaledzin thefintermediate portion of the U-shaped frame member and in the bearing of said cross piece so that the gear housing'may tilt on a transverse horizontal axis lonshaft and projecting inwardly therefrom, a belt verse power take-off shaft atone side thereof, a

sam aaaha to e f d fii e Pr and gearing between the last-named shaft and the power take-off shaft of the tractor, a substantially upright shaft slidable throu h the gear housing and gearedto the 'second named shaft within said gear housing, hydraulic motors comprising cylinders flxed near'their upper "end sto the front and rear sidesv of said gear housing, and pistons reciprocable in said cylinders and having upwardly projecting piston rods, a cross'head having the upper end of said upright shaft swivelled therein intermediate its ends, the upper ends of said piston rods bein'g'secured to theends of said cross head, and means to conduct a pressure fluid to either the upper or lower ends of said cylinders and to conduct the fluid from the other ends thereof.

UNITED STATES PATENTS Number Name Date:

1,879,929 Fortune Sept. 27,1932 2,169,678 Caldwell -r Augie; 1939 2,250,081 Piper July 22,1941 2,480,537 Arps et a1. in Aug.@30, l9 49 

